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Fukushima Unit 3 Containment Inspection To Start October 2015

Fukushima Unit 3 Containment Inspection To Start October 2015

TEPCO  and IRID recently published details on the first efforts to probe the unit 3 reactor at Fukushima Daiichi. In October 2015 we should see the first images from inside the containment structure. Unit 3 was the site of the massive explosion during the reactor meltdowns. High radiation levels in the building have so far prevented workers from conducting any inspections into the reactor systems. The work will also install equipment to better monitor conditions … Read entire article »

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Fukushima Daiichi Unit 3 Spent Fuel Pool Gate Inspected

Fukushima Daiichi Unit 3 Spent Fuel Pool Gate Inspected

The unit 3 spent fuel pool gate was inspected further after concerns that the fuel handling crane could have damaged the gate. The inspections produced a number of photos of the condition of the gates.   This overhead view shows the two gates for the spent fuel pool along with the concrete reactor cover from above. The G2 gate is clearly dislodged from the normal position. This could have been the result of the blast during the meltdown. … Read entire article »

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Fukushima Unit 3 Spent Fuel Pool Gate Damaged

Fukushima Unit 3 Spent Fuel Pool Gate Damaged

NHK is reporting that TEPCO has admitted that two spent fuel pool gates at unit 3 are damaged. They described the first gate as being shifted out of position and that it likely was caused by the refueling crane when it fell into the pool during the blast. The utility considers the second gate to also be shifted but didn’t elaborate. They are currently working on determining if removing the remaining sections of the crane might cause the … Read entire article »

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Fukushima Daiichi Unit 3 Fuel Removal To Start Within Year

Fukushima Daiichi Unit 3 Fuel Removal To Start Within Year

TEPCO told Yomiuri Shimbun that they expect to begin removing spent fuel at the unit 3 reactor within the 2015 fiscal year. Work to remove the damaged fuel handling crane has been delayed until April due to the complexity of the task. TEPCO will need to install a cover building vaguely similar to the one installed on unit 4. The building for unit 3 will have to work around existing structural and technical challenges unique to … Read entire article »

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Oil Leak In Fukushima Daiichi Unit 3 Spent Fuel Pool

Oil Leak In Fukushima Daiichi Unit 3 Spent Fuel Pool

An oil leak occurred in the spent fuel pool of unit 3 at Fukushima Daiichi today as work was under way to remove parts of the fuel handling machine. The fuel crane fell into the spent fuel pool during the massive explosion at unit 3. TEPCO has been taking the crane out in sections. Oil from the crane leaked into the pool as a section was removed. The cooling loop for the spent fuel pool … Read entire article »

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Frozen Wall Delayed As More Concreting At Fukushima Daiichi

Frozen Wall Delayed As More Concreting At Fukushima Daiichi

TEPCO announced a two week delay in work to install a frozen underground wall around the leaking reactors at Fukushima Daiichi. The work has been interrupted by a sudden rush to concrete the unit 3 water handling trench. The change of plans includes what NHK described as an effort to concrete the interface areas between the buildings and the trenches in an attempt to block contaminated water flows. Earlier this year NRA stated that the plant … Read entire article »

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TEPCO Begins Concreting Unit 3 Trench

TEPCO Begins Concreting Unit 3 Trench

TEPCO concreted the unit 3 trench in some unannounced work at Fukushima Daiichi. The unit 2 cable trench had been previously concreted in. Japan’s NRA had recently announced they assume the plant is still leaking out to sea, possibly beneath the wall blocking efforts at the plant. This effort to concrete in the unit 3 trench had not been previously announced and the area had not had any unusually high levels of contamination compared to … Read entire article »

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TEPCO Admonished For Corner Cutting That Caused Massive 2014 Fukushima Radiation Release

NRA has issued an administrative order over the misuse of spray dust inhibitors. While the subject sounds benign, this corner cutting caused the massive release of contaminated dust from the plant that was the biggest release from the plant since the initial disaster. The dust inhibitor liquid used at the plant was supposed to have a 10 part dilutions. TEPCO was diluting it by 100. NRA also found that they were not using it often enough. Instead of spraying it daily or right before work they were only spraying it every few days or few weeks and at these highly diluted rates. This effort to cut corners caused twelve workers at the plant to be contaminated, was found in offsite monitoring nearby and was detected all the way in Miyagi prefecture … Read entire article »

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Fukushima Unit 3 Dust Disperal Hints At Accident Events

Fukushima Unit 3 Dust Disperal Hints At Accident Events

TEPCO’s report on contaminated dust dispersal that ended up contaminating rice fields north of the damaged nuclear site may indicate more about the accident events. The dates where they were removing the sections of the crane and underlying debris from directly over the reactor well coincide with the contamination dates. TEPCO additionally cited that those days lacked rain that otherwise could have helped keep dust from flying away in the wind. The events combined with … Read entire article »

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Fukushima Refueling Machine Portion Falls In Spent Fuel Pool

Fukushima Refueling Machine Portion Falls In Spent Fuel Pool

TEPCO is reporting that the console portion of the refueling machine that fell into the spent fuel pool of unit 3 during the initial explosion has now fallen further into the pool. Workers were attempting to remove the section of the refueling machine from the pool when it broke loose and fell into the pool. TEPCO thinks it fell into a section of the pool beside the fuel racks but will be doing an underwater camera inspection … Read entire article »

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TEPCO To Begin Unit 3 Crane Removal From Spent Fuel Pool

TEPCO To Begin Unit 3 Crane Removal From Spent Fuel Pool

A brief note in the daily reports mentioned that TEPCO will be pausing cooling to the unit 3 spent fuel pool again. This time it is to begin work to remove the refueling crane that fell into the pool during the blast. This work is obviously risky to an extent as they try to remove the heavy refueling crane from the damaged fuel pool. TEPCO previously installed a flexible dam in the pool to try … Read entire article »

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Fukushima Unit 3 Reactor Vessel Failure Preceded Explosion

As part of TEPCO’s admission that 100% of the unit 3 core has melted and left the reactor vessel, they included this new information seen in the graph below. The graph shows the times of events related to the melted fuel. TEPCO now estimates the reactor vessel failed just after about 7 am on March 14th. The pedestal line shows a very rapid shift from the reactor vessel to the pedestal. Not the gradual transition seen between the core and the lower plenum. It also shows between about 6 am on March 14th and 1 pm on March 14th that the molten fuel mass significantly migrated from the pedestal to the drywell of the containment structure. This transition activity from reactor vessel, to pedestal to drywell happened over a 7 … Read entire article »

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TEPCO Admits Unit 3 Had Total Melt Through

TEPCO Admits Unit 3 Had Total Melt Through

TEPCO has admitted that the fuel at unit 3 had a complete melt through. This is where 100% of the fuel melts and drops into the containment vessel. TEPCO previously estimated 60% of the fuel melted through. They now claim that the HPCI (cooling system) ceased working at 5:30 am March 13, 5 hours earlier than the previous estimate. This was 26 hours before the massive hydrogen and steam explosion at unit 3. This piece of … Read entire article »

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Fukushima Trench Freezing Failures & Tactics Technical Report

Fukushima Trench Freezing Failures & Tactics Technical Report

Update: Added table of sea water data at the end and another TEPCO handout on the work released this week. TEPCO admitted a few weeks ago to METI that the trench freezing operation underway for units 2 and 3 was not working. TEPCO initially provided few details but did give a detailed report to METI. Today TEPCO released some ideas for how they intend to overcome the problems but didn’t make the details of the problems … Read entire article »

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Fukushima Unit 3 Demolition Spread Contamination 50km, Multiple Instances

Fukushima Unit 3 Demolition Spread Contamination 50km, Multiple Instances

More information has come out about the contamination caused by the demolition work on unit 3. It was not the government, or TEPCO who found this was happening. Researchers from Kyoto University confirmed the problem in March 2014 and alerted the government. Had the university not been operating dust monitors on a regular basis, this issue likely would not have been admitted or known. 4 trillion becquerels were released in the August 19th incident and spread … Read entire article »

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4 Trillion Becquerels Released Over 4 Hours From Unit 3 During Demolition

4 Trillion Becquerels Released Over 4 Hours From Unit 3 During Demolition

Yahoo News is reporting that over a 4 hour period of demolition work on unit 3 in August 2013, 4 trillion becquerels of contamination were disbursed into the air. Monitoring stations at Futaba, Namie and at the plant were used to make the estimate. It was estimated that a radiation rate of .04 bq/cm was deposited on nearby lands. Plant monitoring for the related dates at Fukushima Daiichi didn’t show significant changes to the monitoring … Read entire article »

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TEPCO Contaminated Nearby Town During Unit 3 Demolition

TEPCO Contaminated Nearby Town During Unit 3 Demolition

TEPCO has admitted to re-contaminating the area around Minamisoma after being confronted by the agriculture ministry. Rice in Minamisoma was found to be over the government radiation limit of 100 bq/kg. Upon further inspection the ministry found it was the outside of the rice plants that had the most contamination rather than the rice kernel itself. This indicated contamination fell on the plants rather than being taken up from the soil. Now TEPCO is admitting on … Read entire article »

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TEPCO Submits Plan For Fuel Removal At Unit 3 Fukushima Daiichi

TEPCO submitted plans to the NRA for spent fuel removal from unit 3. This included more detail on how they intend to install a cover and remove transit casks from the building. The defueling building cover bridges the original reactor building, putting the load on the existing scaffolding system and an accessory building. This structure avoids contact with the reactor well, known to have high radiation levels. TEPCO did not mention any measures to prevent radiation issues from the fuel canal between the reactor and the spent fuel pool. They also do not mention anything about worker exposures or how human work would be conducted. Estimated radiation levels in the area are as high as 1 sievert/hour.     The fuel casks would be moved out of the pool to the left side … Read entire article »

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TEPCO Begins Decontamination Of Unit 3 First Floor

TEPCO Begins Decontamination Of Unit 3 First Floor

TEPCO has begun the further decontamination of the first floor of unit 3. Robots Meister and Sora are doing the work, Meister is hooked to a vacuum collector rig outside the building. Misc debris not already removed is being collected and some surface cleaning is being done. This is an attempt to lower contamination levels further to allow human sustained entry into the building. http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2014/images/handouts_140620_06-e.pdf This article would not be possible without the extensive efforts of the … Read entire article »

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Fukushima Unit 3 Spent Fuel Pool Debris Removal Progress

Fukushima Unit 3 Spent Fuel Pool Debris Removal Progress

TEPCO has progressed on removing debris from the unit 3 spent fuel pool. The current work is to dismantle the fuel handling crane piece by piece and remove it from the pool. The trolley, main hoist and roof trussing that was above the crane have already been removed. Once the last of the fuel handling crane is removed work will begin to remove debris from the cask handling area of the pool. Cask area debris … Read entire article »

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Fukushima Unit 3 Leak Found, Unit 1 Loses Containment Pressure Monitoring

Fukushima Unit 3 Leak Found, Unit 1 Loses Containment Pressure Monitoring

Two significant admissions were made by TEPCO at the end of the week. Unit 3 Scope work into the unit 3 MSIV room found multiple locations where steam pipes were leaking. The handout appears to show locations on the joints of the pipes before the main steam isolation valves where they found leaks. The section where these pipes go through the containment wall have rust traces as if those locations may also be leaking. These are obviously … Read entire article »

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Fukushima Unit 3; MSIV Shows Considerable Damage

Fukushima Unit 3; MSIV Shows Considerable Damage

TEPCO completed an initial inspection of the unit 3 MSIV room that houses valves critical to shutting down the reactor. The room showed considerable damage compared to the same room in unit 2. The damage indicates the room likely had high heat and large amounts of steam for an extended period of time. Water in the room appeared to be leaking from a lower location where the steam pipes are located and not from a … Read entire article »

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Fukushima Unit 3 Crane Leaks Oil Into Spent Fuel Pool

Fukushima Unit 3 Crane Leaks Oil Into Spent Fuel Pool

The refueling crane that crashed into the spent fuel pool of unit 3 has begun leaking oil into the pool. Work is underway to remove the crane from the pool, this may have caused the leak. TEPCO shut off the cooling system for the pool yesterday and reports today that the temperatures in the pool have not increased in any significant way. They have not declared a plan to deal with the oil in the … Read entire article »

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Fukushima Unit 3 Shield Wall Installation Begins

Fukushima Unit 3 Shield Wall Installation Begins

Decontamination work and installation of a shield wall around the reactor well has begun at unit 3 Fukushima Daiichi. The colored sections on the diagram indicate where various types of decontamination will be attempted before the shield wall will go up around the reactor well. The hope is to cut down on radiation from the area so workers can be closer to the refueling floor and to cut down on radiation impact it is causing … Read entire article »

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Fukushima Unit 3 Fuel Pool Debris Removal Progress

Fukushima Unit 3 Fuel Pool Debris Removal Progress

TEPCO has accomplished some debris removal from the spent fuel pool as documented in this report. Earlier in 2014 work was conducted to remove debris that was primarily rebar and handrails. Work in March began to focus on removal roof trussing so they could get closer to removing the fuel handling machine and mast. The pool is still quite full of fine debris on top of the fuel racks as can be seen in the photo. … Read entire article »

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Fukushima 3rd Anniversary; Technical Report Unit 3

Fukushima 3rd Anniversary; Technical Report Unit 3

Unit 3 saw considerable work take place in the last year. The torus of this unit was considered to be leaking as are the other two that suffered meltdowns. TEPCO doesn’t elaborate where and how it is leaking. TEPCO called the unit 3 torus “mostly sound” but didn’t say what way it isn’t sound. Debris removal began on the refueling floor. One piece of debris read 540 mSv/h. TEPCO didn’t show a photo of the specific piece … Read entire article »

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High Levels Of Radiation Found In Fukushima Unit 3 Turbine Building

High Levels Of Radiation Found In Fukushima Unit 3 Turbine Building

TEPCO released radiation readings for water inside the unit 3 turbine building this week. The readings were from December 2013. TEPCO used them as a comparison to show a water leak elsewhere in the building was not reactor water. The readings themselves are a rare find as TEPCO doesn’t usually release this data. The readings are disturbingly high. Reference: No. 3 aircraft turbine building underground reservoir water analysis result ( H25/12/6 sampling ): Cesium-134:   7,300,000 Bq/L Cesium-137: … Read entire article »

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Fukushima Unit 3 Concrete Reactor Cover Damaged

Fukushima Unit 3 Concrete Reactor Cover Damaged

TEPCO has admitted that the concrete reactor well cover on unit 3 has been damaged. They floated two possible causes. One being the explosion itself, the other being the overhead crane falling on the covers as part of the blast. The crane portion that holds the hook is what is assumed to have done the damage. The center panel of the concrete cover is broken and sunken. TEPCO’s report guesses that the lower cover layers are … Read entire article »

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Fukushima Unit 3 Spent Fuel Pool Debris Removal Update

Fukushima Unit 3 Spent Fuel Pool Debris Removal Update

METI has reported some progress and a plan for removing debris out of the unit 3 spent fuel pool. Initial work already in progress includes removal of the steel pool cover and then any rebar than can easily be removed, this work is already underway. Then work will progress in this order: 1.(④, ⑤, ⑥, ⑦) removal mast , roof truss material 2 . Removal of FHM (fuel handling machine) (⑧) 3 . Removal of FHM west end … Read entire article »

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Fukushima Unit 3 Equipment Hatch Damaged

Fukushima Unit 3 Equipment Hatch Damaged

The upper floors of the equipment hatch at unit 3 were found to have some damage on a recent inspection. METI’s report estimates a 50% reduction in seismic resistance in this area. They did not indicate that this would change the plan for installation of the defueling cover but this area currently is planned to be in use for that work. http://www.meti.go.jp/earthquake/nuclear/pdf/131226/131226_01ff.pdf This article would not be possible without the extensive efforts of the SimplyInfo research team Join … Read entire article »

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Fukushima Unit 3 MSIV Room Door Blown In

Fukushima Unit 3 MSIV Room Door Blown In

News 24 is reporting that TEPCO has admitted that the steel door for the MSIV room was found to be blown inward. Due to high radiation levels humans can not go in to retrieve the door and robots are incapable of removing the object. This is cited as the reason for attempting an inspection into the room from the floor above. TEPCO had previously indicated they thought there was possibly standing water in the room, with … Read entire article »

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More On Fukushima Unit 3, TEPCO Fails To Explain Levels

More On Fukushima Unit 3, TEPCO Fails To Explain Levels

TEPCO released two new handouts on the leak at unit 3. This gives some additional insight but still fails to explain a number of critical issues. Handout 1: http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_140122_05-j.pdf Handout 2: http://www.tepco.co.jp/en/nu/fukushima-np/roadmap/images/l140120_01-e.pdf TEPCO does not provide any data to explain their claim for where the water level in containment is. They cite using pressure readings to determine this but give no information to show how they came to such a conclusion. Available pressure readings show a single sensor for the … Read entire article »

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TEPCO Thinks Water Leak At U3 Has Reduced

TEPCO Thinks Water Leak At U3 Has Reduced

TEPCO thinks that the water leak at unit 3 has reduced in volume. They claim nothing has changed in reactor data or water injection rates. They gave no other explanation but did release a new video of the leak area. http://www.youtube.com/watch?v=cEcq1UmBnXQ&feature=youtu.be This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org © 2011-2015 SimplyInfo.org, Fukuleaks.org All Rights Reserved Content cited, quoted etc. from other sources is under the respective rights … Read entire article »

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TEPCO Admits Containment Failure Possible Source Of U3 Leak

TEPCO Admits Containment Failure Possible Source Of U3 Leak

NHK is reporting some newer admissions from TEPCO on the unit 3 water leak found over the weekend. They continue to say they think it is a leak from containment but now admit there could be a failure of one of the steam pipe penetrations. “The officials suspect the water is leaking from around an opening for a steam pipe in the wall of the containment vessel. They said the extra space around the opening had been tightly … Read entire article »

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Unit 3 New Water Leak; TEPCO Explanations Fail To Identify Source

Unit 3 New Water Leak; TEPCO Explanations Fail To Identify Source

TEPCO has reported a leak in unit 3 coming out of the area of the steam tunnel where the main steam isolation valves are. Initially TEPCO reported this as being rainwater with no further proof how they came to that conclusion. Today they claimed it is water from containment without further clarification. A number of people have suggested it may be the MSIV valve or steam line leaking and have concerns that it broke during the … Read entire article »

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Leak At Unit 3 Found To Be High Radiation Water

Leak At Unit 3 Found To Be High Radiation Water

TEPCO announced a leak in unit 3 near the steam tunnel area over the weekend. They initially tried to blame it on rainwater. Now TEPCO has released radiation readings for the leaking water. The radiation levels are considerable and TEPCO claims they are higher than the levels in the cooling injection water. The main steam isolation valves and also the incoming feedwater lines are in this tunnel.     From TEPCO’s press release (machine translated) For water leakage in … Read entire article »

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Unit 3 Fukushima Daiichi Reactor Data

Unit 3 Fukushima Daiichi Reactor Data

There have been a number of unsubstantiated rumors going around about “new problems” at unit 3. Information is always better than rumor. We pulled the reactor data for the last week for unit 3. Temperatures are within expected and historical levels. Xenon 135 is monitored as an indicator of fission and is consistent at levels well below anything that would indicate anything outside of normal for the state of unit 3. The steam at unit … Read entire article »

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TEPCO Begins Seismic Review Of Unit 3

TEPCO Begins Seismic Review Of Unit 3

TEPCO has begun a seismic review of the condition of unit 3. With the debris removed from the refueling floor, efforts have begun to inspect the building for more damage. They will begin reviewing the refueling floor with a camera hung from a crane tomorrow. TEPCO also intends to do similar work on all levels of the building but does not clarify how they intend to reach some portions of the building that fell in … Read entire article »

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Unit 3 Spent Fuel Pool; Debris Removal Preparation Begins

Unit 3 Spent Fuel Pool; Debris Removal Preparation Begins

Kyodo News announced yesterday that preparations are underway to remove the debris from the unit 3 spent fuel pool at Fukushima Daiichi. The debris in unit 3′s spent fuel pool is much more excessive and complicated than unit 4. In unit 3′s pool is a tangle of rebar and concrete along with the refueling crane. The refueling crane apparently fell in the pool during the explosion. One end landed on the fuel racks. Along with the … Read entire article »

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Debris Removal At 1st Floor Unit 3 Fukushima Underway

Debris Removal At 1st Floor Unit 3 Fukushima Underway

TEPCO mentions that debris removal work on the 1st floor of unit 3 is underway. The work had been on various planning documents but is now confirmed to be ongoing. The work is being done by way of robotic equipment. The confirmation came as the SoRa robot developed an oil leak. This debris removal will help both robots and workers gain entry to more of the building. SoRa was built by Hitachi-GE. TEPCO does not state … Read entire article »

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